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Finding the Fourth Proportional to 390,645.77, 539,102.54 and 220,876.25

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Solution

The fourth proportional to 390,645.77, 539,102.54 and 220,876.25 is: 304,815.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,645.77 : 539,102.54 = 220,876.25 : x
  2. Step 2: Convert to fraction form
    390,645.77/539,102.54 = 220,876.25/x
  3. Step 3: Cross multiply
    390,645.77x = 539,102.54 × 220,876.25
  4. Step 4: Simplify right side
    390,645.77x = 119,074,947,400.68
  5. Step 5: Solve for x
    x = 119,074,947,400.68/390,645.77
  6. Step 6: Final answer
    x = 304,815.66

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.